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(Solved): Find the length of the curve. \[ \mathbf{r}(t)=\cos (3 t) \mathbf{i}+\sin (3 t) \mathbf{j}+3 \ln (\ ...




Find the length of the curve.
\[
\mathbf{r}(t)=\cos (3 t) \mathbf{i}+\sin (3 t) \mathbf{j}+3 \ln (\cos (t)) \mathbf{k}, \quad
Find the length of the curve. \[ \mathbf{r}(t)=\cos (3 t) \mathbf{i}+\sin (3 t) \mathbf{j}+3 \ln (\cos (t)) \mathbf{k}, \quad 0 \leq t \leq \frac{\pi}{4} \]


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